Gallery, Projects and General > Project Logs

The Return of No. 83, a Hot Air Engine

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vtsteam:
I made up a new displacer cylinder this afternoon, same bore but with sides at the hot end thinned from .047" to .014" (1.2 to 0.36 mm).

The older recent cylinder is shown next to it.

 

vtsteam:
New displacer cylinder: 1400 RPM!

Linkages a blur.

 

vtsteam:
Today I decided to sleeve the existing oversized displacer cylinder hole in the bulkhead. I made a decision to change the cylinder mount method. Instead of press fitting the cylinder in place (or holding it with grub screws in an oversized hole), I'm going to mount it with a flange. This will allow easier replacement when experimenting. It will also allow easier alignment of the bore, and it will give better cooling at the cold end.  Part of the working bore will now be in the aluminum bulkhead, rather than inside a stainless steel section situated in the bulkhead.

To do all this I need to make a plug sleeve out of aluminum, and press that into the bulkhead. Here's the start:

 

vtsteam:
Drilling out the plug:

 

vtsteam:
Pressed into the bulkhead:

 

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